Method of manufacture of box and structure thereof



April 18, 1961 H, V, BOLD|NG 2,980,308

METHOD OF' MANUFACTURE OF' BOX AND STRUCTURE THEREOF Filed March 8, 195'? I 2 Sheets-Sheet l F /E.l

2 Z9 Q8 32 F/E. 2/ 2 0 f ATTORNEY April 18, 1961 H. v. BOLDING 2,980,308

METHOD OF MANUFACTURE OF'v BOX AND STRUCTURE THEREOF Filed March 8, 195'? 2 Sheets-Sheet 2 1N VENTOR HUE/Q7' V' BoLD/NG ATTORNEY METHOD F MANUFACTURE 0F BOX AND STRUCTURE THEREOF Hubert V. Bolding, Jeffersonville, Ind., assignor'to Standard Packaging Corporation, New York, N.Y., a corporation of Virginia Filed Mar. 8, 1957, Ser. No. 644,843

1 Claim. (Cl. 229-31) My invention relates to a new and improved method for manufacturing an erectable tray-type box from a single blank. Further my invention relates to a traytype, single-blank' box structure which incorporates elements for facilitating erection of the box by the simpleV application of opposed forces.

The method for making the box involves the steps of cutting and scoring a flat blank of sheet material, su'ch as paperboard and the like, to provide longitudinal and transverse score or hinge lines which define a rectangular main panel from which extend two side walls and two end walls. Erecting panels extend from the transverse score lines on the end walls and force transmitting means are transversely hinged lto the end edges of the side Walls. Each force transmitting means includes a first member which is diagonally scored at 45 on a Vline from an adjacent corner of the main panel, and a second member which is transversely hinged at a score line to the end edge of the first member.

The cut and scored blank is then subjected to two folding operations. The first folding step involves the folding of the side walls and the force transmitting means inwardly through an arc of substantially 180. The

second step involves the folding of the erecting panels and the second members of the force transmitting means through an arc of substantially 180.

After 'the first folding step, the second members of the force transmitting means are inV a temporary first position inface-to-face sliding engagement with predeter` mined portions of the erecting panels. The second fold-A ing step causes the second members to slide across the faces of the erecting panels in a longitudinal'direction toward the outer transverse ends of the erecting panels and.r assumea final second position. Y

`'Ihre second members are then finally aiiixedV` to the erectingy panels to maintain their final position therewith. In this manner return hinging movement of the erecting panels islimited to an arc ofv substantially less than 180.1 andr slightly more than 90.

Toprovide end Wall structures having a minimum of internal-stress yet rigid construction,.the transverse score lines betweenlthe side Walls and the first members of the force transmitting means are positioned longitudinally inwardly a small distance from the adjacent transverse endl score lines of the main panel. In'v this fashiorra space is provided between the end of each side wall and the respective end wall to accommodate the force transmitting means in sandwiched condition between the end walls and the erecting panels without causing undue internal stress or bucking of the side walls, thereby utilizing the entire strength of the blank as set up to provide a rigid box structure.

A double-thickness or two-ply Wall may be provided for the entire wall structure of the box by adding side wall liners to the outer longitudinal edges of the side walls in the blank. Suitable means for interlocking the erecting panels at the corners of the box are provided for maintaining the box in erected condition. 1

Fig. 4 isa view similar to Fig. 3 with the erecting panels folded inwardly;

Fig. 5 is a perspective view of the box in condition for erection by a user;

Fig. 6 is a perspective view of the erected box;

Pig. 7 is an enlarged perspective view of a corner of a box in condition for erection;

Fig. 8 is a view similar to Fig. 7 with the box halfway erected;

Fig. 9 is a perspective view of the upper left-hand `portion of Fig. 3 taken on line 9 9;

Fig. 10 isa sectional perspective view of Fig. 9 taken on line 1'0-'10 with the erecting panel raised to the vertical;

Fig. 1l is a sectional perspective view similar to Fig. 10 with the erecting' panel swung inwardly to the horii zontal; and

Fig. l2Y is a sectional perspective view similar 'to Fig. ll with the erecting panel swung outwardly to the fullest extent possible after the box has been completely manufactured.

As seen in Figs. 1-6, my invention comprises a blank which is cut and scored to provide a rectangular main panel 15, end Wallsv 16 transversely hinged to the opposed end edges 17 thereof, side walls 18 longitudinally hinged to the opposed side edges 19 thereof, erecting panels 20' transversely hinged to the outer end edges 21 of the end walls, and force transmitting means 22 transversely hinged' to the end edges`23 of the side walls 18. Each force transmitting means 22 is transversely scored at 3'4 to define a first member 31 and asecond member 32, the first member V31 being diagonally scored at 45 from4 the intersection of the hinge lines 19 and 23 to provide hinges 33.3

To provide double or two-ply side wall structures, side` In manufacture; sheet material is cut and scored to form the blankV of Fig. l, which is then longitudinally moved'in the direction of the arrow shown in the center of the blank through automatic box making machinery which folds the side liner panels 24 inwardly over the side walls 18 (Fig. 2). The blank continues longitudinal forward movement through the machine and the side walls 18 and force transmitting means 2?. are folded inwardly (Fig. 3), thereby placing the side walls 18 over the main panel 15, the first members 3l over the end walls 16, and the second members 32 over the erecting panels 20.

The blank is then moved transversely as shown by the arrow on the blank in Fig. 4, and the erecting panels 26 are folded inwardly, thereby causing the second members 32 to slide on the erecting panels 20 longitudinally Pantented Apr. 18, 1961` .final second positionV as shown in YFig-r1 l... The second Vmember 32 is` then permanently affixed tontlleerecting` panel 20. As seen in Fig. 12, the possible returnhinging `toward, the outer transverse edges 27 thereof to a nal second position. The second members 32 are then permanently atlixed to predetermined portions of the erectingpanels 20,;F

Y The box is then vincondition for shipment va usen and, when used, the carton will'be in VtheAconditio njshownV Y ing-Fig. SY-whereby opposing forces appliedv-at-the ends will automatically bring the walls into verticaL-position which will not permanently set up for a period of, for

Y example, ten to twelve seconds, whereby the blank of Fig. l may be moved by the machinery through the various stages to the stage shown in Fig. 4 where iinal permanent adherence can be' accomplished.

Various-other modified forms of the invention will be apparent from the foregoing descriptionV and for that reason -I-.wish to limit myself. only within the .scope of Inithis connection, although itV has not been indicated in Figures l and 12, when thererepcting panels'20g-are raised tor-upright positions, the otset relation v betweenfthe hinge lines 21 and 34 will cause the firstV mernbersglvto be,

lifted with, respect to the'adjacentfaces of-theend walls 16% VThe erectingranels 20 mar the-nib@ swunadown:

` wardly in toyverticalporsition to accomplishinterlocking Yof themeans for maintaining the-bgxwfjnv erected ConditiQn- In this particular embodiment-1t11e-tabs '-2.8 Snap' into the notches 30 in the'side-wall liners 24,.-

- VIn the methodY above, theA blarilcisV prefierv'ablygsent through an adhesive,Y applying mechanism prior to folding wherebyY longitudinal paths S410i-'adhesive are ap- .plied tothe outer edgesofV the side wall liners 24 and rectangular Yareas 35 are vapplied to the erectinggpanels 20. It will be appreciated that other adhesive arrangements on-the blank could bey employed, if c iesirerd.y

Upon Verection ofthe carton the first members 31 will fold alongrtheir diagonalscore linesl 33, fas shown Vin the enlarged views of Figs. 7 and 8. It will benoted.

A` tray ftype er'evctablei boxcomprisinginicollapsed condition, a rectangular main panelfe'nd'walls hinged to the opposite end edgesof said-mainpanel and extending outwardly of and v'substantially'Yxiplai'iarwith said main panel, side Vwalls.longitudinally'hinged to the opposed side edges of said main. panel and extending inwardly so as to overlie said main-panel, erecting panels hinged toj the4 outer jend edgesxof saidend wallsand overlyingv said-v -end l walls; 1. motion transmitting connections between said side; walls and said erecting panels, each Vof said, motion transmitting connections; including'a rst member hinged to 'an-lend edge-of one ofsaid. side walls and lying in the same plane therewith so 'as Atoovrlie part of the adjacent endV wal1,' and a second'member hinged to the lend edge of said irstmember on aline y substantially juxtaposed hutgoisetinwardlyof the Ahinge line,` between4 the 'l end wall rand-' the erecting panel, said second-,member being interposed betweenthe firstmernin Figs. 5 ,and 7-that the side walls 18tend Vto bow Vupwardly when the box is in collapsed'condition, Ythis property facilitating the proper folding of the iirst members.

i 31, This property is built into the box structure duringY the manufacture thereof. It will` be Ynoted in Fig. 4 that thereV are fewer plies of cardboardfat the sides of the blank than at the ends of the blank, thereby reducing. the pressing' or creasing of "thegscore Alines `19 between" the main panell Vand the Vsidewalls 18whenV the blank is passed between pressers to set linally the glued areas.

Y As seen in Figs.V Y9-12, the'second member 32,v when folded inwardly over thejerectingipanel 120, assumes a 20 inwardly; about transverse score jline 21 through an ber and theadjacenterectingpanel and'aiixed in vface-to. face relationship withsaid-adjacent erecting panel so. as

to niaintain-V thejuxtaposed relationship; Y'ing the; yhingesy between the iirst,andsecondmenbers `on the Aonehand a'rn'ltheV endV wallV and ftheeretingfpanel gon the other hand, thespacingV between jthe; saidY otset hingelines being such as to aiordy aghinged-rnovement to said erecting panel of more thanQQQdegrees andi less f than 180 degrees-from apositon overlying theendfwall, the. said offset-hinge lines-causin'g. thef pivotal Amovement ofthe Vtemporary iirst position, Upon foldingthe erecting panel..

arcV of substantially 180,the secondjmember'SZ .slides 1 across the faceof the erecting` panel v2,0, reaching its action of the erecting panel is thereby limited to-sub ,stantially less Ythan 18.0 and slightlyrfrnore' than 90 ,v Y the full opening pivotal movement being shown* V1n"- 'Fig. 12.f Y

. To reduce the internal stresses at the. end'v'wall Ystruc;-V tures of the box, the transversescore lines 23 offthe Vforce transmitting means are positioned.longitudinally .inwardly of the transverse end edgesv 17 ot the main panel 1 5, thereby providinghousing room for thel forcel transmitting means within the space formedibythe ,end walls 16 andthe erecting panels 20. IL-will 4be noted A that hinge lines 34'of the` second members 32 are similarly spaced inwardly foithe-same purpose. Y

Preferably adhesives are usedV and applied at an earlystage of manufacture,l these adhesives beingzof the type n condition whenl the box is 'erecteM erectingv panel fromy itsY collapsed condition to, lirftfthe irstmernber in relation'to the adjacent end wa1lto help' start thelproper erection ,of the carton,said first member havingl aV diagonally hinged lineausingjhe upper'surfaces of the two sectionsldefned; 'therebyto assume face-tO-face engagement .in erected; condition, and locking means carried by each; of the erecting panels for maintainingthe end; Ywalls and :the side walls in erected a g mannaggia@*ai-fissati ha fait 1. .y :U'NITED srATnsPAraNTs'. l 1,354,012 

